<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>from</title>
</head>
<body>

    <form action="https://www.sogou.com/index.html" method="post">
    <input type="text" name="username">
    <input type="text" name="username1">
    <input type="text" name="username2">
    <input type="submit" value="发送">
    </form>

</body>
</html>